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Chapitre D'ouvrage Année : 2018

X-Ray, Radio and SEP Observations of Relativistic Gamma-Ray Events

Résumé

The rather frequent occurrence, and sometimes long duration, of γ-ray events at photon energies above 100 MeV challenges our understanding of particle acceleration processes at the Sun. The emission is ascribed to pion-decay photons due to protons with energies above 300 MeV. We study the X-ray and radio emissions and the solar energetic particles (SEPs) in space for a set of 25 Fermi γ-ray events. They are accompanied by strong SEP events, including, in most cases where the parent activity is well-connected, protons above 300 MeV. Signatures of energetic electron acceleration in the corona accompany the impulsive and early post-impulsive γ-ray emission. γ-ray emission lasting several hours accompanies in general the decay phase of long-lasting soft X-ray bursts and decametric-to-kilometric type II bursts. We discuss the impact of these results on the origin of the γ-ray events.

Dates et versions

hal-03728308 , version 1 (20-07-2022)

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Karl-Ludwig Klein, Kostas Tziotziou, Pietro Zucca, Eino Valtonen, Nicole Vilmer, et al.. X-Ray, Radio and SEP Observations of Relativistic Gamma-Ray Events. Malandraki, Olga E.; Crosby, Norma B. Solar Particle Radiation Storms Forecasting and Analysis, 444, pp.133-155, 2018, ⟨10.1007/978-3-319-60051-2_8⟩. ⟨hal-03728308⟩
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